MTHFR and coronary artery disorder: The data showed that the MTHFR C667T genetic polymorphisms was significantly associated with the increased risk for all CHD cases in the homozygote comparison (TT versus CC: OR = 6, 95% CI = 2.9–12.4), heterozygote comparison (CT versus CC: OR = 3.04, 95% CI = 1.55–5.95), dominant model (TT/CT versus CC: OR = 3.91, 95% CI = 2.06–7.44), recessive model (TT versus CT/CC: OR = 2.62, 95% CI = 1.60–7.44), and allele comparison (T versus C: OR = 2.26, 95% CI = 1.64–3.12) as presented in Table 2.